Malicious PDF — malware analysis report

Static analysis result for SHA-256 871bc94289ea94e0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 20:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9e2a26afad1d7c1425800bf27c483aa SHA-1: e23ab7b177daeab74ba96b61a16e47528c9ca736 SHA-256: 871bc94289ea94e0c48fb75d7293bed263f42fe1724aa301f588046edeaaceb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=notebook+computer+definition+pdf PDF link annotation
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b61a1805200d4d786901631934b42575/31139000471.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/928bd3d8eea374c2f94f7a8ed670a514/90219613363.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/41266102913.pdfIn PDF document text
    • https://5udua.com/contents/files/28020874346.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ac88e788690f0044a0e5a4da61b5ad55/volujivoradinosuxukipivu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/titirunavodenagevotozif.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/57553090042.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/96742008833.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/vowajobosileforipeli.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210623213824.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/bidusukidazuzo.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/lurumil.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c62bd4581a923e6cb5ae50d28e7fd107/72904746357.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/f529174fa74105ba8ea8553e0deda296/56883887884.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kad18uusfjne4o4mm5tp83sgjt/76143181003.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/49tgd15612kkjkvjm2sla6k9i2/64288766632.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/43763576174.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f82f0fe60bd---kuwujotunujumake.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/308caa28327f329dda055c8da85b47ee/98328534393.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vewakopilixiwobike.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/gikivovugipopom.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dbb364eea92429c98c5c78c357705d43/kevobekisesa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 17888 bytes
SHA-256: 37816c933dc69e53c281419ac9d70d848d99c90b82b8be211d6f0afc915a0c8f
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 10712 bytes
SHA-256: 7efbdaf897c01cc399346a4d254d04c83985d9a4443fa984ed4f236b43edf07d

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